Hi,
I have a '98 GMC Safari.
My top blower vent seems to have some kind of problem. It blows very lightly occasionally and full power at others. The fan sounds normal -- it comes on and you can feel it blowing through the lower vents consistently.
The best I can try to do to replicate the problem consistently is as follows:
-set the fan on high, blowing through the top and bottom vents
-accelerate very hard from a dead stop
-by the time I'm at about 35-40 mph, the fan starts blowing weak
-when I hit the brakes and start slowing down again, the fan comes back on full power
The top vent comes on and off while driving on the highway and around town.
I recently had the shop reconnect the top vent, which before was not blowing at all. They said the hose that connects to the vents was disconnected. I think they must have reconnected something improperly.
Any ideas?
Thanks,
Steve
'98 GMC Safari